Class: RDF::Literal::Date

Inherits:
Temporal show all
Defined in:
lib/rdf/model/literal/date.rb

Overview

A date literal.

Constant Summary collapse

DATATYPE =

Since:

  • 0.2.1

RDF::URI("http://www.w3.org/2001/XMLSchema#date")
GRAMMAR =

Since:

  • 0.2.1

%r(\A(#{YEARFRAG}-#{MONTHFRAG}-#{DAYFRAG})(#{TZFRAG})?\z).freeze
FORMAT =

Since:

  • 0.2.1

'%Y-%m-%d'.freeze

Constants inherited from Temporal

Temporal::DAYFRAG, Temporal::EODFRAG, Temporal::HOURFRAG, Temporal::MINUTEFRAG, Temporal::MONTHFRAG, Temporal::SECONDFRAG, Temporal::TZFRAG, Temporal::YEARFRAG, Temporal::ZONE_GRAMMAR

Constants inherited from RDF::Literal

FALSE, TRUE, ZERO

Instance Attribute Summary

Attributes inherited from RDF::Literal

#datatype, #language

Instance Method Summary collapse

Methods inherited from Temporal

#+, #-, #<=>, #==, #adjust_to_timezone, #adjust_to_timezone!, #canonicalize!, #day, #hours, #milliseconds?, #minutes, #month, #seconds, #timezone, #timezone?, #to_s, #tz, #valid?, #year

Methods inherited from RDF::Literal

#<=>, #==, #canonicalize!, #compatible?, #comperable_datatype2?, #comperable_datatype?, #datatype?, #eql?, #escape, #hash, #inspect, #language?, #literal?, #method_missing, #object, #plain?, #respond_to_missing?, #simple?, #squish, #squish!, #to_s, #valid?, #validate!, #value, #value_hash

Methods included from Term

#<=>, #==, #compatible?, #eql?, #escape, #term?, #terms, #to_base, #to_term

Methods included from Value

#anonymous?, #canonicalize, #canonicalize!, #constant?, #graph?, #inspect, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #start_with?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #valid?, #validate!, #variable?

Constructor Details

#initialize(value, datatype: nil, lexical: nil, **options) ⇒ Date

Note:

If initialized using the #to_datetime method, time component is unchanged. Otherewise, it is set to 00:00 (midnight).

Internally, a Date is represented using a native ::DateTime object at midnight. If initialized from a ::Date, there is no timezone component, If initialized from a ::DateTime, the timezone is taken from that native object, otherwise, a timezone (or no timezone) is taken from the string representation having a matching zzzzzz component.

Parameters:

  • value (String, Date, #to_datetime)
  • value (Object)
  • language (Symbol)

    (nil) Language is downcased to ensure proper matching

  • lexical (String) (defaults to: nil)

    (nil) Supplied lexical representation of this literal, otherwise it comes from transforming value to a string form..

  • datatype (URI) (defaults to: nil)

    (nil)

  • validate (Boolean)

    (false)

  • canonicalize (Boolean)

    (false)

Since:

  • 0.2.1


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# File 'lib/rdf/model/literal/date.rb', line 20

def initialize(value, datatype: nil, lexical: nil, **options)
  @datatype = RDF::URI(datatype || self.class.const_get(:DATATYPE))
  @string   = lexical || (value if value.is_a?(String))
  @object   = case
    when value.class == ::Date
      @zone = nil
      # Use midnight as midpoint of the interval
      ::DateTime.parse(value.strftime('%FT00:00:00'))
    when value.respond_to?(:to_datetime)
      dt = value.to_datetime
      @zone = dt.zone
      dt
    else
      md = value.to_s.match(GRAMMAR)
      _, dt, tz = Array(md)
      if tz
        @zone = tz == 'Z' ? '+00:00' : tz
      else
        @zone = nil # No timezone
      end
      # Use midnight as midpoint of the interval
      ::DateTime.parse("#{dt}T00:00:00#{@zone}")
  end rescue ::DateTime.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Literal

Instance Method Details

#humanize(lang = :en) ⇒ String

Returns a human-readable value for the literal

Returns:

Since:

  • 1.1.6


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# File 'lib/rdf/model/literal/date.rb', line 50

def humanize(lang = :en)
  d = object.strftime("%A, %d %B %Y")
  if timezone?
    d += if @zone == '+00:00'
      " UTC"
    else
      " #{@zone}"
    end
  end
  d
end